1 // This is mozilla/security/manager/ssl/src/md4.c, CVS rev. 1.1, with trivial
2 // changes to port it to our source tree.
3 //
4 // WARNING: MD4 is cryptographically weak. Do not use MD4 except in NTLM
5 // authentication.
6
7 /* vim:set ts=2 sw=2 et cindent: */
8 /* ***** BEGIN LICENSE BLOCK *****
9 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
10 *
11 * The contents of this file are subject to the Mozilla Public License Version
12 * 1.1 (the "License"); you may not use this file except in compliance with
13 * the License. You may obtain a copy of the License at
14 * http://www.mozilla.org/MPL/
15 *
16 * Software distributed under the License is distributed on an "AS IS" basis,
17 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
18 * for the specific language governing rights and limitations under the
19 * License.
20 *
21 * The Original Code is Mozilla.
22 *
23 * The Initial Developer of the Original Code is IBM Corporation.
24 * Portions created by IBM Corporation are Copyright (C) 2003
25 * IBM Corporation. All Rights Reserved.
26 *
27 * Contributor(s):
28 * Darin Fisher <darin@meer.net>
29 *
30 * Alternatively, the contents of this file may be used under the terms of
31 * either the GNU General Public License Version 2 or later (the "GPL"), or
32 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
33 * in which case the provisions of the GPL or the LGPL are applicable instead
34 * of those above. If you wish to allow use of your version of this file only
35 * under the terms of either the GPL or the LGPL, and not to allow others to
36 * use your version of this file under the terms of the MPL, indicate your
37 * decision by deleting the provisions above and replace them with the notice
38 * and other provisions required by the GPL or the LGPL. If you do not delete
39 * the provisions above, a recipient may use your version of this file under
40 * the terms of any one of the MPL, the GPL or the LGPL.
41 *
42 * ***** END LICENSE BLOCK ***** */
43
44 /*
45 * "clean room" MD4 implementation (see RFC 1320)
46 */
47
48 #include "net/http/md4.h"
49
50 #include <string.h>
51
52 typedef uint32 Uint32;
53 typedef uint8 Uint8;
54
55 /* the "conditional" function */
56 #define F(x,y,z) (((x) & (y)) | (~(x) & (z)))
57
58 /* the "majority" function */
59 #define G(x,y,z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
60
61 /* the "parity" function */
62 #define H(x,y,z) ((x) ^ (y) ^ (z))
63
64 /* rotate n-bits to the left */
65 #define ROTL(x,n) (((x) << (n)) | ((x) >> (0x20 - n)))
66
67 /* round 1: [abcd k s]: a = (a + F(b,c,d) + X[k]) <<< s */
68 #define RD1(a,b,c,d,k,s) a += F(b,c,d) + X[k]; a = ROTL(a,s)
69
70 /* round 2: [abcd k s]: a = (a + G(b,c,d) + X[k] + MAGIC) <<< s */
71 #define RD2(a,b,c,d,k,s) a += G(b,c,d) + X[k] + 0x5A827999; a = ROTL(a,s)
72
73 /* round 3: [abcd k s]: a = (a + H(b,c,d) + X[k] + MAGIC) <<< s */
74 #define RD3(a,b,c,d,k,s) a += H(b,c,d) + X[k] + 0x6ED9EBA1; a = ROTL(a,s)
75
76 /* converts from word array to byte array, len is number of bytes */
w2b(Uint8 * out,const Uint32 * in,Uint32 len)77 static void w2b(Uint8 *out, const Uint32 *in, Uint32 len)
78 {
79 Uint8 *bp; const Uint32 *wp, *wpend;
80
81 bp = out;
82 wp = in;
83 wpend = wp + (len >> 2);
84
85 for (; wp != wpend; ++wp, bp += 4)
86 {
87 bp[0] = (Uint8) ((*wp ) & 0xFF);
88 bp[1] = (Uint8) ((*wp >> 8) & 0xFF);
89 bp[2] = (Uint8) ((*wp >> 16) & 0xFF);
90 bp[3] = (Uint8) ((*wp >> 24) & 0xFF);
91 }
92 }
93
94 /* converts from byte array to word array, len is number of bytes */
b2w(Uint32 * out,const Uint8 * in,Uint32 len)95 static void b2w(Uint32 *out, const Uint8 *in, Uint32 len)
96 {
97 Uint32 *wp; const Uint8 *bp, *bpend;
98
99 wp = out;
100 bp = in;
101 bpend = in + len;
102
103 for (; bp != bpend; bp += 4, ++wp)
104 {
105 *wp = (Uint32) (bp[0] ) |
106 (Uint32) (bp[1] << 8) |
107 (Uint32) (bp[2] << 16) |
108 (Uint32) (bp[3] << 24);
109 }
110 }
111
112 /* update state: data is 64 bytes in length */
md4step(Uint32 state[4],const Uint8 * data)113 static void md4step(Uint32 state[4], const Uint8 *data)
114 {
115 Uint32 A, B, C, D, X[16];
116
117 b2w(X, data, 64);
118
119 A = state[0];
120 B = state[1];
121 C = state[2];
122 D = state[3];
123
124 RD1(A,B,C,D, 0,3); RD1(D,A,B,C, 1,7); RD1(C,D,A,B, 2,11); RD1(B,C,D,A, 3,19);
125 RD1(A,B,C,D, 4,3); RD1(D,A,B,C, 5,7); RD1(C,D,A,B, 6,11); RD1(B,C,D,A, 7,19);
126 RD1(A,B,C,D, 8,3); RD1(D,A,B,C, 9,7); RD1(C,D,A,B,10,11); RD1(B,C,D,A,11,19);
127 RD1(A,B,C,D,12,3); RD1(D,A,B,C,13,7); RD1(C,D,A,B,14,11); RD1(B,C,D,A,15,19);
128
129 RD2(A,B,C,D, 0,3); RD2(D,A,B,C, 4,5); RD2(C,D,A,B, 8, 9); RD2(B,C,D,A,12,13);
130 RD2(A,B,C,D, 1,3); RD2(D,A,B,C, 5,5); RD2(C,D,A,B, 9, 9); RD2(B,C,D,A,13,13);
131 RD2(A,B,C,D, 2,3); RD2(D,A,B,C, 6,5); RD2(C,D,A,B,10, 9); RD2(B,C,D,A,14,13);
132 RD2(A,B,C,D, 3,3); RD2(D,A,B,C, 7,5); RD2(C,D,A,B,11, 9); RD2(B,C,D,A,15,13);
133
134 RD3(A,B,C,D, 0,3); RD3(D,A,B,C, 8,9); RD3(C,D,A,B, 4,11); RD3(B,C,D,A,12,15);
135 RD3(A,B,C,D, 2,3); RD3(D,A,B,C,10,9); RD3(C,D,A,B, 6,11); RD3(B,C,D,A,14,15);
136 RD3(A,B,C,D, 1,3); RD3(D,A,B,C, 9,9); RD3(C,D,A,B, 5,11); RD3(B,C,D,A,13,15);
137 RD3(A,B,C,D, 3,3); RD3(D,A,B,C,11,9); RD3(C,D,A,B, 7,11); RD3(B,C,D,A,15,15);
138
139 state[0] += A;
140 state[1] += B;
141 state[2] += C;
142 state[3] += D;
143 }
144
145 namespace net {
146 namespace weak_crypto {
147
MD4Sum(const Uint8 * input,Uint32 inputLen,Uint8 * result)148 void MD4Sum(const Uint8 *input, Uint32 inputLen, Uint8 *result)
149 {
150 Uint8 final[128];
151 Uint32 i, n, m, state[4];
152
153 /* magic initial states */
154 state[0] = 0x67452301;
155 state[1] = 0xEFCDAB89;
156 state[2] = 0x98BADCFE;
157 state[3] = 0x10325476;
158
159 /* compute number of complete 64-byte segments contained in input */
160 m = inputLen >> 6;
161
162 /* digest first m segments */
163 for (i=0; i<m; ++i)
164 md4step(state, (input + (i << 6)));
165
166 /* build final buffer */
167 n = inputLen % 64;
168 memcpy(final, input + (m << 6), n);
169 final[n] = 0x80;
170 memset(final + n + 1, 0, 120 - (n + 1));
171
172 inputLen = inputLen << 3;
173 w2b(final + (n >= 56 ? 120 : 56), &inputLen, 4);
174
175 md4step(state, final);
176 if (n >= 56)
177 md4step(state, final + 64);
178
179 /* copy state to result */
180 w2b(result, state, 16);
181 }
182
183 } // namespace net::weak_crypto
184 } // namespace net
185